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authorVianney le Clément de Saint-Marcq <vianney.leclement@essensium.com>2015-03-24 16:54:15 +0100
committerJonathan Cameron <jic23@kernel.org>2015-03-29 16:17:12 +0100
commitbad4d1a074c7ba29636b951520574e18aec4c7fe (patch)
treea09405ded4560e47788f56be73667853c2f580d2 /drivers/iio/temperature
parent209c00691938c4b3d58142b05ca6f50b8971e521 (diff)
iio: mlx90614: Support devices with dual IR sensor
The model is detected by reading the EEPROM configuration during probing. Signed-off-by: Vianney le Clément de Saint-Marcq <vianney.leclement@essensium.com> Cc: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio/temperature')
-rw-r--r--drivers/iio/temperature/mlx90614.c67
1 files changed, 57 insertions, 10 deletions
diff --git a/drivers/iio/temperature/mlx90614.c b/drivers/iio/temperature/mlx90614.c
index a2e3aa6aa39d..a112fc9abf43 100644
--- a/drivers/iio/temperature/mlx90614.c
+++ b/drivers/iio/temperature/mlx90614.c
@@ -2,6 +2,7 @@
* mlx90614.c - Support for Melexis MLX90614 contactless IR temperature sensor
*
* Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net>
+ * Copyright (c) 2015 Essensium NV
*
* This file is subject to the terms and conditions of version 2 of
* the GNU General Public License. See the file COPYING in the main
@@ -59,26 +60,34 @@ static int mlx90614_read_raw(struct iio_dev *indio_dev,
int *val2, long mask)
{
struct mlx90614_data *data = iio_priv(indio_dev);
+ u8 cmd;
s32 ret;
switch (mask) {
case IIO_CHAN_INFO_RAW: /* 0.02K / LSB */
switch (channel->channel2) {
case IIO_MOD_TEMP_AMBIENT:
- ret = i2c_smbus_read_word_data(data->client,
- MLX90614_TA);
- if (ret < 0)
- return ret;
+ cmd = MLX90614_TA;
break;
case IIO_MOD_TEMP_OBJECT:
- ret = i2c_smbus_read_word_data(data->client,
- MLX90614_TOBJ1);
- if (ret < 0)
- return ret;
+ switch (channel->channel) {
+ case 0:
+ cmd = MLX90614_TOBJ1;
+ break;
+ case 1:
+ cmd = MLX90614_TOBJ2;
+ break;
+ default:
+ return -EINVAL;
+ }
break;
default:
return -EINVAL;
}
+
+ ret = i2c_smbus_read_word_data(data->client, cmd);
+ if (ret < 0)
+ return ret;
*val = ret;
return IIO_VAL_INT;
case IIO_CHAN_INFO_OFFSET:
@@ -110,6 +119,16 @@ static const struct iio_chan_spec mlx90614_channels[] = {
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
BIT(IIO_CHAN_INFO_SCALE),
},
+ {
+ .type = IIO_TEMP,
+ .indexed = 1,
+ .modified = 1,
+ .channel = 1,
+ .channel2 = IIO_MOD_TEMP_OBJECT,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ },
};
static const struct iio_info mlx90614_info = {
@@ -117,11 +136,25 @@ static const struct iio_info mlx90614_info = {
.driver_module = THIS_MODULE,
};
+/* Return 0 for single sensor, 1 for dual sensor, <0 on error. */
+static int mlx90614_probe_num_ir_sensors(struct i2c_client *client)
+{
+ s32 ret;
+
+ ret = i2c_smbus_read_word_data(client, MLX90614_CONFIG);
+
+ if (ret < 0)
+ return ret;
+
+ return (ret & MLX90614_CONFIG_DUAL_MASK) ? 1 : 0;
+}
+
static int mlx90614_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct iio_dev *indio_dev;
struct mlx90614_data *data;
+ int ret;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
return -ENODEV;
@@ -139,8 +172,21 @@ static int mlx90614_probe(struct i2c_client *client,
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &mlx90614_info;
- indio_dev->channels = mlx90614_channels;
- indio_dev->num_channels = ARRAY_SIZE(mlx90614_channels);
+ ret = mlx90614_probe_num_ir_sensors(client);
+ switch (ret) {
+ case 0:
+ dev_dbg(&client->dev, "Found single sensor");
+ indio_dev->channels = mlx90614_channels;
+ indio_dev->num_channels = 2;
+ break;
+ case 1:
+ dev_dbg(&client->dev, "Found dual sensor");
+ indio_dev->channels = mlx90614_channels;
+ indio_dev->num_channels = 3;
+ break;
+ default:
+ return ret;
+ }
return iio_device_register(indio_dev);
}
@@ -170,5 +216,6 @@ static struct i2c_driver mlx90614_driver = {
module_i2c_driver(mlx90614_driver);
MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
+MODULE_AUTHOR("Vianney le Clément de Saint-Marcq <vianney.leclement@essensium.com>");
MODULE_DESCRIPTION("Melexis MLX90614 contactless IR temperature sensor driver");
MODULE_LICENSE("GPL");